National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Sherman/Denison, Grayson County Airport (KGYI)

Lat: 33.72°NLon: 96.67°WElev: 748ft.

Overcast with Haze

79°F

26°C

Humidity 84%
Wind Speed S 16 mph
Barometer 29.87 in
Dewpoint 73°F (23°C)
Visibility 5.00 mi
Heat Index83°F (28°C)
Last update 18 May 8:50 am CDT
Extended Forecast for

4 Miles NE Collinsville TX

  • Today

    Today: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly cloudy, with a high near 87. South wind around 20 mph, with gusts as high as 30 mph.

    High: 87 °F

    Chance
    T-storms

  • Tonight

    Tonight: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 73. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.

    Low: 73 °F

    Slight Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 83. South wind 5 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 83 °F

    Showers

  • Tuesday Night

    Tuesday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 63. Northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 63 °F

    Chance
    T-storms then
    Showers
    Likely

  • Wednesday

    Wednesday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Northeast wind 5 to 10 mph.

    High: 77 °F

    Chance
    T-storms then
    Chance
    Showers

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 63. East northeast wind 5 to 10 mph.

    Low: 63 °F

    Slight Chance
    Showers then
    Chance
    Showers

  • Thursday

    Thursday: Showers likely and possibly a thunderstorm. Cloudy, with a high near 76. East wind 5 to 10 mph. Chance of precipitation is 70%.

    High: 76 °F

    Showers
    Likely

  • Thursday Night

    Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Cloudy, with a low around 63. East southeast wind around 5 mph. Chance of precipitation is 70%.

    Low: 63 °F

    Showers
    Likely

  • Friday

    Friday: A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78. South wind around 5 mph.

    High: 78 °F

    Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

Today
A 30 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Mostly cloudy, with a high near 87. South wind around 20 mph, with gusts as high as 30 mph.
Tonight
A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms after 4am. Increasing clouds, with a low around 73. South wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 20%.
Tuesday
A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7am. High near 83. South wind 5 to 15 mph becoming north northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Cloudy, with a low around 63. Northeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Wednesday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 77. Northeast wind 5 to 10 mph.
Wednesday Night
A 50 percent chance of showers, mainly after 1am. Mostly cloudy, with a low around 63. East northeast wind 5 to 10 mph.
Thursday
Showers likely and possibly a thunderstorm. Cloudy, with a high near 76. East wind 5 to 10 mph. Chance of precipitation is 70%.
Thursday Night
Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Cloudy, with a low around 63. East southeast wind around 5 mph. Chance of precipitation is 70%.
Friday
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a high near 78. South wind around 5 mph.
Friday Night
A 40 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 63.
Saturday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 81.
Saturday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 64.
Sunday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NE Collinsville TX
 33.59°N 96.84°W (Elev. 758 ft)
Last Update:
7:06 am CDT May 18, 2026
Forecast Valid:
9am CDT May 18, 2026-6pm CDT May 24, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation